Northwest Fisheries Science Center

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Document Type: Journal Article
Center: NWFSC
Document ID: 8224
Title: Environmental influences on the seasonal distribution of Vibrio parahaemolyticus in Puget Sound
Author: Rohinee N. Paranjpye, William B. Nilsson, Martin Liermann, Elizabeth D. Hilborn, Barbara J. George, Quanlin Li, Brian D. Bill, Vera L. Trainer, Mark S. Strom, Paul A. Sandifer
Publication Year: 2015
Journal: FEMS Microbiology Ecology
Keywords: Vibrio parahaemolyticus, Harmful algal blooms, Forecasting,Vibrio parahaemolyticus,HAB forecasting,forecasting,Vibrio parahaemolyticus,HAB forecasting,Vibrio parahaemolyticus,HAB forecasting,Pacific Northwest,pathogens,climate,model,

Occurrence and distribution of harmful algal blooms (HABs) and pathogenic Vibrio bacteria historically have been assessed separately. In this study we assessed the correlation of total (tl+) and potentially virulent (tdh+) V. parahaemolyticus in water with 3 HAB-causing genera, (Pseudo-nitzschia, Alexandrium and Dinophysis), abundance of diatoms and dinoflagellates at 5 sites in Washington State over two years (2008-2009). Along with temperature and salinity, samples were analyzed for the macronutrients phosphate, nitrate and silicate, ammonium and chlorophyll-a. We found that V. parahaemolyticus density was not directly dependent on water temperature, salinity or any of the phytoplankton species. The only significant nutrient associated with V. parahaemolyticus density was silicate. The best predictor of V. parahaemolyticus density in water was seasonality, in that maximum densities of this bacterium occurred in June of both years prior to the highest seasonal water temperature, although concentrations of both total and tdh+ V. parahaemolyticus were higher on average in 2008 than 2009. A high proportion of samples were positive for tdh and at levels not reported elsewhere. Differences in salinity, nutrients and the phytoplankton populations in both coastal and estuarine sampling sites did not affect the concentrations of either total or tdh+ V. parahaemolyticus suggesting that complex environmental controls affect the occurrence of Vibrios in this region.

Full Text URL: doi: 10.1093/femsec/fiv121
Theme: Sustainable, safe and secure seafood for healthy populations and vibrant communities
Foci: Provide scientific support to ensure safe seafood for healthy populations and characterize how human activities and climate affect risks from pathogens, chemical contaminants and biotoxins
Official Citation:

  Paranjpye, R.N., W. B. Nilsson, M. Liermann, E. D. Hilborn, B. J. George, Q. Li, B. D. Bill, V. L.Trainer, M. S. Strom, P. A. Sandifer. 2015. Environmental influences on the seasonal distribution ofVibrio parahaemolyticus in the Pacific Northwest of the U.S. FEMs Microbial Ecol. 91:2015 fic121.